Synthesis and characterization of new aromatic poly(amide-imide)s derived from bis(3-trimellitimidophenyl) phenyl phosphine oxide and various aromatic diamines

Abstract

New aromatic poly(amide-imide)s with high inherent viscosities were prepared by direct polycondensation reaction of diimide-diacid (I) and aromatic diamines using triphenyl phosphite in N-methyl-2-pyrrolidone (NMP)/pyridine solution containing dissolved CaCl 2 . The bis(3-trimellitimidophenyl) phenyl phosphine oxide (I) was readily obtained by the condensation reaction of bis(3-aminophenyl) phenyl phosphine oxide (BAPPO) with trimellitic anhydride. The resulting poly(amide-imide)s showed high thermostability. Their decomposition temperatures at 10% weight loss in nitrogen atmosphere were above 532 ºC and the anaerobic char yield at 800 ºC ranged from 56% to 74%. Almost all the poly(amide-imide)s showed high glass transition temperature above 233 ºC by differential scanning calorimetry (DSC) measurements. These polymers were readily soluble in various organic solvents and by their casting into transparent, tough and flexible films can be easily achieved.

Facile synthesis of new thermally stable and organo-soluble polyamide-imides from phosphorus-containing aromatic amines and various dianhydrides

“…The polymers with phosphorus moieties have major advantages, including good flame-retardant properties, high thermal oxidative stability, and enhanced solubility in organic solvents which may be due to presence of the hydrolytically stable P-C bond [27][28][29][30].…”

Preparation and properties of flame retardant poly(urethane‐imide)s containing phosphine oxide moiety

“…Starting diamino compounds bis(3-aminophenyl)methylphosphine oxide (BAMPO) and bis(3aminophenyl)phenyl phosphine oxide (BAPPO) were synthesized according to the procedure A mixture of trimellitic anhydride (1.92 g, 9.8 mmol) and bis-(3-aminophenyl) methyl phosphine oxide (BAMPO) (1.37 g, 4.9 mmol) in dried DMAc (50 mL) were stirred at room temperature for 6 h. Amic acid was precipitated from methanol (300 mL), filtered and dried under vacuum for 24 h. Amic acid was obtained as a pale yellow solid with high yield, about 90%. 40 …”